Ok, so I thought about this thread really long. I believe, you have to look at three different groups of women when considering "perfect" breasts:
#1: slim / average girls with natural tits
#2: chubby girls with natural tits
#3: girls with fake tits.
Honestly, I like girls from all three groups. I don't have a preference, there are just so many hotties out there...
So here's my shot at #1, slim / average women with perfect natural breasts, hope you like 'em: